Electronic musical instruments of the type synthesizing a plurality of partial tone signals

An electronic musical instrument comprising a plurality of windowed partial tone component calculating channels, including:

• tone color setting means for setting a tone color selected among a plurality of tone colors, and for each channel;
• time window signal generating means for generating a time window signal having a time width;
• frequency signal generating means for generating a frequency signal having a frequency;
• control means connected to said tone color setting means for determining said time width of said time window signal generated by said time window signal generating means and said frequency of said frequency signal generated by said frequency signal generating means for said each channel in accordance with the set tone color;
• and
• modulating means for amplitude modulating said frequency signal with said time window signal and for outputting a modulated signal for each channel, said modulated signal containing a plurality of partial tone components whose frequencies are determined by said time width and said frequency for the corresponding channel;
• together with:
• synthesizing means for synthesizing a musical tone signal from the independent modulated signals from each calculating channel;
• and
• sound system means for converting the synthesized modulated signals to a musical tone.

An electronic musical instrument of the type in which a musical tone is generated by computing successive sample point amplitudes of said tone at regular time intervals, said successive sample point amplitudes being established by a phase designation signal which is incremented in accordance with the fundamental frequency of the tone to be generated, comprising:

• time division channel means for establishing a small plurality of time division channels corresponding in number to the number of windowed partial tone components which are to be included in each sample point computation, each channel being divided into two parts, in one of which the current value of a time window signal is calculated, said time window signal having a selectable with relationship with respect to a period of said fundamental frequency of the tone to be generated, in the other of which the current value of a frequency signal of selectable order is calculated,
• phase designation signal generator means, operative during said one part of each time division channel, for establishing the effective phase angle value of said time window signal and for establishing a trigonometric signal corresponding thereto, and operative during said other part of each time division channel, for establishing the effective phase angle value of a frequency signal having a frequency corresponding to said selectable order and for establishing a trigonometric signal corresponding thereto,
• arithmetic processing means, effective during each time division channel, for multiplying the established trigonometric signal for said time window signal by the established trigonometric signal for said frequency signal, and
• synthesizing means for accumulating the multiplication products for all channels to establish each computed sample point amplitude.